言うなら

if you say

→ 言う
phrase Very common #1,128
if you say A conditional form of 言う, used when referring to something someone says or is about to say. Depending on context, it can also mean “if I had to put it into words.”
JA: 言うなら、今のうちに言ってください。
EN: If you're going to say it, please say it now.

文句言うなら自分でやってみろ

If you’re going to complain, try doing it yourself.

一言言うなら彼女の問題は内気なことだ

In a word, her problem is that she's shy.

それを言うなら何百万

If you’re going to put it that way, it’s millions.

— ウエスタン (1968)

彼が言うなら待機する

If he says so, I’ll wait.

— ANORA アノーラ (2024)

君がそこまで言うならそうしよう

If you insist, let's do it.

彼女が言うなら間違いない

If she says so, it must be true.

— レベッカ (1940)

文句言うなら自分でやれよ

If you're going to complain, do it yourself.